Jacanas are wading birds famous for one wild adaptation: absurdly long toes that let them stroll across lily pads as if they were solid ground. Found in warm wetlands worldwide, they've earned nicknames like "lily-trotters" and "Jesus birds" for their water-walking trick.
But the toes are only half the story. Jacanas also flip the usual bird script on parenting and mating, making them one of the more unusual case studies in the animal kingdom.
Jacanas belong to the family Jacanidae, a group of wading birds found in tropical and subtropical wetlands across South and Central America, Africa, Asia, and Australia.
Their toes and claws are the longest relative to body size of any bird, spreading the jacana's weight across floating leaves and plants so it can walk on lily pads without sinking.
This toe-spreading trick is why jacanas are nicknamed "lily-trotters" and sometimes "Jesus birds," since they appear to walk on water.
Most jacana species are small to medium-sized, ranging roughly 15 to 30 cm (6 to 12 inches) long, with brightly colored plumage, bills, or facial shields depending on the species.
Jacanas are omnivores that forage in shallow water and on floating vegetation, eating insects, other invertebrates, seeds, and occasionally small fish or frogs.
Jacanas practice polyandry: a single female mates with and defends a territory containing several males, an arrangement that is rare among birds.
In this sex-role-reversed system, male jacanas build the nest, incubate the eggs, and raise the chicks almost entirely on their own.
Female jacanas are typically larger than males, another feature tied to their dominant role in courtship and territory defense.
Jacana chicks are precocial, meaning they can walk and even swim within hours of hatching, though the male parent continues to guard and warm them.
When danger threatens the brood, some male jacanas can tuck chicks under their wings and carry them to safety, walking or even flying short distances with young tucked against their body.
Jacanas have loud, harsh calls used to defend territory and communicate alarm, which is why some species are also known for their noisy, chattering vocalizations.
Most jacana species are largely sedentary or nomadic, moving between wetlands in response to changing water levels and flooding rather than making long seasonal migrations.
One notable exception is the pheasant-tailed jacana of Asia, part of whose population does migrate seasonally, moving to warmer wetlands in the dry season.
Jacanas help control insect populations in wetlands and, by feeding on aquatic vegetation and moving between ponds, can play a role in dispersing plant seeds.
Wetland drainage, pollution, and habitat loss are the main threats to jacana populations in many parts of their range.
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